from django.shortcuts import render,get_object_or_404
# from django.http import Http404
# Create your views here.
from django.db.models import F
from django.http import HttpResponseRedirect,HttpResponse
from django.urls import reverse
from django.views import generic
from django.utils import timezone

from .models import Question,choice

# def index(request):
#     latest_question_list = Question.objects.order_by("-pub_date")[:5]
#     #template = loader.get_template("polls/index.html")
#     context = {"latest_question_list": latest_question_list}
#     #return HttpResponse(template.render(context, request))
#     return render(request, "polls/index.html", context)

# def detail(request,question_id):
#     #return HttpResponse("You are looking at question %s." % question_id)
#     try:
#         question = Question.objects.get(pk=question_id)
#     except Question.DoesNotExist:
#         raise Http404("Question does not exist")
#     return render(request, "polls/detail.html", {"question": question})

# def result(request,question_id):
#     # return HttpResponse("You are looking at results of question %s." % question_id)
#     question = get_object_or_404(Question, pk=question_id)
#     return render(request, "polls/results.html", {"question": question})

class IndexView(generic.ListView):
    template_name = "polls/index.html"
    context_object_name = "latest_question_list"

    def get_queryset(self):
        return Question.objects.filter(pub_date__lte=timezone.now()).order_by("-pub_date")[:5]

class DetailView(generic.DetailView):
    model = Question
    template_name = "polls/detail.html"

    def get_queryset(self):
        return Question.objects.filter(pub_date__lte=timezone.now())

class ResultView(generic.DetailView):
    model = Question
    template_name = "polls/result.html"


def vote(request,question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST["choice"])
    except (KeyError, choice.DoesNotExist):
        return render(request, "polls/detail.html", {
            "question": question,
            "error_message": "You didn't select a choice.",
        })
    else:
        selected_choice.votes = F("votes") + 1
        selected_choice.save()
        return HttpResponseRedirect(reverse("polls:result", args=(question.id,)))
